Respuesta :

hnori22003

x + 20 = 72

x + 20 - 20 = 72 - 20

x = 52

wegnerkolmp2741o

Answer:

x=52

Step-by-step explanation:

The exterior angle of the triangle is equal to the sum of the opposite interior angles

72 = 20+x

72-20 = 20+x-20

52 =x